Knowledge Flashcards Preview

Year 8 Yearlies > Knowledge > Flashcards

Flashcards in Knowledge Deck (48)
Loading flashcards...
1

Define the term static electricity

Static electricity is the build of charges on an object

2

Outline what is meant by ‘charge’

An electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. There are two types of electric charge, positive or negative.

3

Explain how a charge is produced in an object

Electric charge is the result of excess or insufficiency of electrons (negatively charged particles) as compared to protons (positively charged particles)

4

Identify situations in which static electricity can become dangerous

- pumping petrol at a service station with a phone

- if you touch a person being electrocuted while the current is still running through them

5

Identify situations in which station static electricity can be a nuisance

- when it cause dirt and dust to become attracted to insulators

- when it causes clothing to cling

6

Define the term gravity

Gravity is a force that pulls everything towards Earth because Earth has a large mass

7

State why gravity pulls objects towards the Earth

Being Earth has a large mass

8

Identify common uses of magnets

Microphone
Bank cards
Scrap yards
Headphones and speakers
Alarm bells
Safes
Door locks

9

Identify how different poles of magnates interact with each other

Unlike poles attract while like poles repel

10

Identify that the Earth’s rotations

The earth rotates on its axis. This is the reason why we have day and night and the sun appears to rise and set. Rotation is like a spinning top.

11

Explain why we experience night and day

We experience night and day because the Earth rotates on its axis. The sun appears to rise and set because of this as well.

12

Explain why we experience seasons

Earth’s revolution around the sun and the tilt of the Earth’s axis gives us seasons

13

Briefly outline the history of the telescope

First optical telescope was developed by Galilei in 1609
He used it to view Earth’s moon, moons of Jupiter and Saturn’s rings
The Hubble telescope was launched in 1990
Hubble has provided info to work out the age of the universe

14

Describe how an optical telescope works

Optical telescopes work by using light to function
All light that travels through a biconvex lens is bent towards one point

15

Discuss how advances in telescope technology have changed or enhanced our understanding of the solar system

Telescopes allow us to see distant objects more clearly
Showed us that the moon has craters
Showed us there are many more stars then we thought
Showed us Saturn has rings
Opened us up to a variety of planets

16

Describe filtration and give examples of where it is used

Filtration is a separation technique where a mixture is poured through a filter, the liquid passes through the filter paper and the solids are left behind
Can only be used to separate suspensions not a solution

A/C
Cigarette
Clothes dryer
Coffee machine
Colander

17

Decantation definition and examples of where it is used

Decanting is just allowing a mixture of solid and liquid or two liquids to settle and separate by gravity. Once the mixture contents have separated, the lighter liquid is poured off leaving the heavier liquid or solid behind. This process can be very slow

Can be used to separate
Oil and water
Dirt and water
Wine
Cream and milk
Blood and plasma

18

Magnetic separation definition and where it is used

Magnetic separation is the process of separating components of mixtures by using magnets to attract magnetic materials

At recycling centres
Mining

19

Evaporation definition and when it is used

Evaporation is used to separate a soluble solid from a solution. The solution is heated so that the water evaporates and leaves the dissolved solid behind

Removing salt from sea water
Removing water from a mineral sample
Removing water from plant material
Dehydrating food

20

Crystallisation definition and where it is used

Crystallisation is a separation technique in which the solution is warned in an open container. This allows the solvent to evaporate forming a saturated solution. As the saturation solution is allowed to cool, the solid will come out of the solution and crystals will start to grow

Making art
Making crystals for decoration

21

Chromatography definition and where it is used

This is a separation technique to separate a mixture by passing it in a solution or suspension through a medium in which the components moves at different rates
Help catch criminals
Analysis blood and cloth samples

22

Distillation definition and where it is used

A technique used to separate liquid from a mixture. The solution is heated so that the liquid evaporates and is turned into a gas. Everything else is left behind. The gas coil and turns back to a liquid.
Produces important products from crude oil
Used to increase the alcohol content of alcoholic drinks

23

Describe Conduction and give examples of where it’s seen

The transfer of heat through collisions between particles
After a car is turned on
A radiator
Heating pad

24

Describe convection and where it can been

The transfer of heat through the flow of particles

Water boiling in a pot

25

Describe radiation and where it can be seen

A method of heat transfer that does not require particles in order to transfer heat from one place to another

Soils
Air
Water
Food

26

Define the term energy efficiency and discuss implications of energy efficiency

Energy efficiency means using less energy to perform the same task to eliminate energy waste.
Implications of energy efficiency include:
Reduce greenhouse gas emissions and energy import dependency
Create jobs
Boost energy security

27

Outline and discuss advances in the efficiency of appliances such as light globes and cooking appliances

Well, appliances these days are a lot more reliable then they used to be. They last longer and the way they are made is more intricate and in most cases, machines make them which leaves little room for mistakes.

28

Identify the main parts/organs involved in the digestive system and state the roll of it

The digestive system breaks down food and allows it to be absorbed into the bloodstream.
The parts/organs involved in this process are:
Teeth
Saliva
Oesophagus
Liver
Stomach
Pancreas
Small intestine
Large intestine
Rectum

29

Identify the main parts/organs involved in the respiratory system and the role of it

The respiratory system allows for oxygen and carbon dioxide to move in and out of the body. This process involves:
Trachea
Bronchi
Alveoli
Diaphragm
Ribs

30

Identify the main parts/organs involved in the circulatory system and the roll of it

The circulatory system carries oxygen, food and waste around the body. This process involves:
Heart
Lungs
Arteries
Veins
Coronary
Portal vessels